Jérôme Proulx is professor of Didactique des mathématiques in the mathematics department of the Université du Québec à Montréal, Québec, Canada. Working in mathematics education research, he is particularly interested in contemporary learning theories and epistemologies, as one of his research interests concerns the theorization of teaching based on these developments. For more details on the author and his work, see http://www.math.uqam.ca/jproulx. He can also be reached via e-mail at: proulx.jerome@uqam.ca.